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This reference and business resource is the culmination of Crain's year-round efforts to gather data on businesses in Southeast Michigan.

Most lists are updated versions of ones we published throughout 2012, while others have been developed specifically for this issue.

The listed companies provided most of the information in this book by responding to Crain's surveys, faxes and e-mails to businesses and other organizations throughout metro Detroit. Information also is collected from other sources, such as public documents, news services and other published reports.